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                                <h1 id="&#x897F;&#x74DC;&#x4E66;&#x6982;&#x5FF5;">&#x897F;&#x74DC;&#x4E66;&#x6982;&#x5FF5;</h1>
<h2 id="&#x7B2C;&#x56DB;&#x7AE0;-&#x51B3;&#x7B56;&#x6811;">&#x7B2C;&#x56DB;&#x7AE0; &#x51B3;&#x7B56;&#x6811;</h2>
<ul>
<li><p>Page73: &#x51B3;&#x7B56;&#x6811;(363)&#xFF08;decision tree&#xFF09;</p>
<p>  &#x4EE5;&#x4E8C;&#x5206;&#x7C7B;&#x4EFB;&#x52A1;&#x4E3A;&#x4F8B;&#xFF0C;&#x6211;&#x4EEC;&#x5E0C;&#x671B;&#x4ECE;&#x7ED9;&#x5B9A;&#x8BAD;&#x7EC3;&#x6570;&#x636E;&#x96C6;&#x5B66;&#x5F97;&#x4E00;&#x4E2A;&#x6A21;&#x578B;&#x7528;&#x4EE5;&#x5BF9;&#x65B0;&#x793A;&#x4F8B;&#x8FDB;&#x884C;&#x5206;&#x7C7B;&#xFF0C;&#x8FD9;&#x513F;&#x628A;&#x6837;&#x672C;&#x5206;&#x7C7B;&#x7684;&#x4EFB;&#x52A1;&#xFF0C;&#x53EF;&#x4EE5;&#x770B;&#x505A;&#x4E3A;&#x5F53;&#x524D;&#x6837;&#x672C;&#x662F;&#x5426;&#x5C5E;&#x4E8E;&#x6B63;&#x7C7B;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#x7684;&#x51B3;&#x7B56;&#x6216;&#x5224;&#x5B9A;&#x8FC7;&#x7A0B;&#xFF0C;&#x51B3;&#x7B56;&#x6811;&#x662F;&#x57FA;&#x4E8E;&#x6811;&#x7ED3;&#x6784;&#x8FDB;&#x884C;&#x51B3;&#x7B56;&#x7684;&#xFF0C;&#x51B3;&#x7B56;&#x65F6;&#x901A;&#x5E38;&#x4F1A;&#x8FDB;&#x884C;&#x4E00;&#x7CFB;&#x5217;&#x5224;&#x65AD;&#x6216;&#x5B50;&#x51B3;&#x7B56;&#xFF0C;&#x51B3;&#x7B56;&#x7684;&#x8FC7;&#x7A0B;&#x5F62;&#x6210;&#x4E00;&#x4E2A;&#x6811;&#x7ED3;&#x6784;&#x3002;</p>
</li>
<li><p>Page73: &#x5224;&#x5B9A;&#x6811;</p>
<p>  &#x540C;&#x51B3;&#x7B56;&#x6811;</p>
</li>
<li><p>Page74: &#x5206;&#x800C;&#x6CBB;&#x4E4B;&#xFF08;divide-and-conquer&#xFF09;</p>
<p>  &#x5206;&#x89E3;&#x95EE;&#x9898;&#x5206;&#x522B;&#x8FDB;&#x884C;&#x5904;&#x7406;&#x7684;&#x7B56;&#x7565;&#x3002;</p>
</li>
<li><p>Page75: ID3&#x51B3;&#x7B56;&#x6811;&#xFF08;Iterative Dichotomiser decision tree&#xFF09;</p>
<p>  &#x4EE5;&#x4FE1;&#x606F;&#x589E;&#x76CA;&#x4E3A;&#x51C6;&#x5219;&#x6765;&#x5212;&#x5206;&#x5C5E;&#x6027;&#x7684;&#x8FED;&#x4EE3;&#x4E8C;&#x5206;&#x5668;&#x51B3;&#x7B56;&#x6811;&#x3002;</p>
</li>
<li><p>Page75: &#x5212;&#x5206;&#x9009;&#x62E9;</p>
<p>  &#x51B3;&#x7B56;&#x6811;&#x5B66;&#x4E60;&#x7B97;&#x6CD5;&#x6700;&#x91CD;&#x8981;&#x7684;&#x5730;&#x65B9;&#x5C31;&#x662F;&#x9009;&#x62E9;&#x6700;&#x4F18;&#x5212;&#x5206;&#x5C5E;&#x6027;&#x3002;</p>
</li>
<li><p>Page75: &#x4FE1;&#x606F;&#x589E;&#x76CA;&#xFF08;information gain&#xFF09;</p>
<p>  &#x5C5E;&#x6027;&#x5212;&#x5206;&#x51CF;&#x5C11;&#x7684;&#x4FE1;&#x606F;&#x71B5;&#xFF0C;&#x4FE1;&#x606F;&#x71B5;&#x662F;&#x5EA6;&#x91CF;&#x6837;&#x672C;&#x96C6;&#x5408;&#x7EAF;&#x5EA6;&#x7684;&#x4E00;&#x79CD;&#x6307;&#x6807;&#xFF0C;&#x5047;&#x8BBE;&#x7B2C;k&#x7C7B;&#x6837;&#x672C;&#x6240;&#x5360;&#x6BD4;&#x4F8B;&#x4E3A;pk&#xFF0C;&#x5219;&#x6570;&#x636E;&#x96C6;D&#x7684;&#x4FE1;&#x606F;&#x71B5;&#x4E3A;&#xFF1A;<script type="math/tex; ">Ent(D)=-\sum pklogpk</script>&#xFF0C;<script type="math/tex; ">Ent(D)</script>&#x8D8A;&#x5C0F;&#xFF0C;D&#x7684;&#x7EAF;&#x5EA6;&#x8D8A;&#x9AD8;&#x3002;</p>
<p>  <script type="math/tex; ">Gain(D,a)=Ent(D)-\sum \frac{Dv}{D*Ent(Dv)}</script>&#xFF0C;Dv&#x662F;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;a&#x7684;&#x67D0;&#x4E2A;&#x53EF;&#x80FD;&#x53D6;&#x503C;&#x7684;&#x6837;&#x672C;&#x96C6;&#x5408;</p>
</li>
<li><p>Page77: &#x589E;&#x76CA;&#x7387;&#xFF08;gain ratio&#xFF09;</p>
<p>  &#x4FE1;&#x606F;&#x589E;&#x76CA;&#x51C6;&#x5219;&#x5BF9;&#x53EF;&#x53D6;&#x503C;&#x6570;&#x76EE;&#x8F83;&#x591A;&#x7684;&#x5C5E;&#x6027;&#x6709;&#x504F;&#x597D;&#xFF0C;&#x4E3A;&#x51CF;&#x5C11;&#x8FD9;&#x79CD;&#x504F;&#x597D;&#x7684;&#x4E0D;&#x5229;&#x5F71;&#x54CD;&#xFF0C;&#x4F7F;&#x7528;&#x589E;&#x76CA;&#x7387;&#x9009;&#x62E9;&#x6700;&#x4F18;&#x5212;&#x5206;&#x5C5E;&#x6027;&#xFF0C;&#x589E;&#x76CA;&#x7387;&#x5B9A;&#x4E49;&#x4E3A;:<script type="math/tex; ">Gain\_ratio(D,a)=\frac{Gain(D,a)}{IV(a)}</script>, <script type="math/tex; ">IV(a)=-\sum \frac{Dv}{D*log(Dv/D)}</script>&#xFF0C;IV(a)&#x79F0;&#x4E3A;&#x4E3A;a&#x7684;&#x56FA;&#x6709;&#x503C;&#x3002;&#x5C5E;&#x6027;&#x53EF;&#x80FD;&#x53D6;&#x503C;&#x6570;&#x76EE;&#x8D8A;&#x591A;&#xFF0C;IV(a)&#x7684;&#x503C;&#x8D8A;&#x5927;&#xFF0C;&#x589E;&#x76CA;&#x7387;&#x5373;&#x589E;&#x76CA;/&#x56FA;&#x6709;&#x503C;</p>
</li>
<li><p>Page78: C4.5&#x51B3;&#x7B56;&#x6811;(page83)</p>
<p>  &#x57FA;&#x4E8E;&#x589E;&#x76CA;&#x7387;&#x548C;&#x4E8C;&#x5206;&#x6CD5;&#xFF0C;&#x53EF;&#x5904;&#x7406;&#x8FDE;&#x7EED;&#x503C;&#x7684;&#x51B3;&#x7B56;&#x6811;</p>
</li>
<li><p>Page79: CART&#x51B3;&#x7B56;&#x6811;(Classfication and Regression Tree)</p>
<p>  &#x4F7F;&#x7528;&#x57FA;&#x5C3C;&#x6307;&#x6570;&#x5212;&#x5206;&#x5C5E;&#x6027;&#x7684;&#x51B3;&#x7B56;&#x6811;&#x3002;</p>
</li>
<li><p>Page79: &#x540E;&#x526A;&#x679D;&#xFF08;postpruning&#xFF09;</p>
<p>  &#x5148;&#x4ECE;&#x8BAD;&#x7EC3;&#x96C6;&#x751F;&#x6210;&#x4E00;&#x9897;&#x5B8C;&#x6574;&#x7684;&#x51B3;&#x7B56;&#x6811;&#xFF0C;&#x7136;&#x540E;&#x81EA;&#x5E95;&#x5411;&#x4E0A;&#x5730;&#x5BF9;&#x975E;&#x53F6;&#x8282;&#x70B9;&#x8FDB;&#x884C;&#x8003;&#x5BDF;&#xFF0C;&#x82E5;&#x5C06;&#x8BE5;&#x7ED3;&#x70B9;&#x5B50;&#x6811;&#x66FF;&#x6362;&#x6210;&#x53F6;&#x8282;&#x70B9;&#x80FD;&#x63D0;&#x5347;&#x6CDB;&#x5316;&#x6027;&#x80FD;&#xFF0C;&#x5219;&#x8FDB;&#x884C;&#x66FF;&#x6362;&#xFF0C;&#x540E;&#x526A;&#x679D;&#x8BAD;&#x7EC3;&#x65F6;&#x95F4;&#x5F00;&#x9500;&#x5927;&#x3002;</p>
</li>
<li><p>Page79: &#x57FA;&#x5C3C;&#x6307;&#x6570;&#xFF08;Gini index&#xFF09;</p>
<p>  <script type="math/tex; ">Gini(D) = \sum\sum p(x=k)*p(x \neq k)</script>,&#x53CD;&#x6620;&#x4E86;&#x4ECE;&#x6570;&#x636E;&#x96C6;D&#x4E2D;&#x968F;&#x673A;&#x62BD;&#x53D6;&#x4E24;&#x4E2A;&#x6837;&#x672C;&#xFF0C;&#x5176;&#x7C7B;&#x522B;&#x6807;&#x8BB0;&#x4E0D;&#x4E00;&#x81F4;&#x7684;&#x6982;&#x7387;&#x3002; </p>
</li>
<li><p>Page79: &#x526A;&#x679D;(352)&#xFF08;pruning&#xFF09;
  &#x51B3;&#x7B56;&#x6811;&#x5B66;&#x4E60;&#x7B97;&#x6CD5;&#x5BF9;&#x4ED8;&#x8FC7;&#x62DF;&#x5408;&#x7684;&#x4E3B;&#x8981;&#x624B;&#x6BB5;&#xFF0C;&#x4E3A;&#x4E86;&#x5C3D;&#x53EF;&#x80FD;&#x6B63;&#x786E;&#x5206;&#x7C7B;&#x8BAD;&#x7EC3;&#x6837;&#x672C;&#xFF0C;&#x7ED3;&#x70B9;&#x5212;&#x5206;&#x8FC7;&#x7A0B;&#x5C06;&#x4E0D;&#x65AD;&#x91CD;&#x590D;&#xFF0C;&#x6709;&#x65F6;&#x4F1A;&#x9020;&#x6210;&#x51B3;&#x7B56;&#x6811;&#x5206;&#x652F;&#x8FC7;&#x591A;&#xFF0C;&#x56E0;&#x8BAD;&#x7EC3;&#x6837;&#x672C;&#x8FC7;&#x5EA6;&#x5B66;&#x4E60;&#x5BFC;&#x81F4;&#x5C06;&#x8BAD;&#x7EC3;&#x96C6;&#x81EA;&#x8EAB;&#x7684;&#x7279;&#x70B9;&#x5F53;&#x505A;&#x6240;&#x6709;&#x6570;&#x636E;&#x90FD;&#x5177;&#x6709;&#x7684;&#x4E00;&#x822C;&#x6027;&#x8D28;&#x800C;&#x5BFC;&#x81F4;&#x8FC7;&#x62DF;&#x5408;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x901A;&#x8FC7;&#x4E3B;&#x52A8;&#x53BB;&#x6389;&#x4E00;&#x4E9B;&#x5206;&#x652F;&#x6765;&#x964D;&#x4F4E;&#x8FC7;&#x62DF;&#x5408;&#x7684;&#x98CE;&#x9669;&#x3002;</p>
</li>
<li><p>Page79: &#x9884;&#x526A;&#x679D;(352)&#xFF08;prepruning&#xFF09;</p>
<p>  &#x5728;&#x51B3;&#x7B56;&#x6811;&#x751F;&#x6210;&#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;&#x5BF9;&#x6BCF;&#x4E2A;&#x7ED3;&#x70B9;&#x5728;&#x5212;&#x5206;&#x524D;&#x5148;&#x8FDB;&#x884C;&#x4F30;&#x8BA1;&#xFF0C;&#x82E5;&#x5F53;&#x524D;&#x7ED3;&#x70B9;&#x7684;&#x5212;&#x5206;&#x4E0D;&#x80FD;&#x5E26;&#x6765;&#x51B3;&#x7B56;&#x6811;&#x6CDB;&#x5316;&#x6027;&#x80FD;&#x7684;&#x63D0;&#x5347;&#xFF0C;&#x5219;&#x505C;&#x6B62;&#x5212;&#x5206;&#x5E76;&#x5C06;&#x5F53;&#x524D;&#x7ED3;&#x70B9;&#x6807;&#x8BB0;&#x4E3A;&#x53F6;&#x8282;&#x70B9;&#xFF0C;&#x9884;&#x526A;&#x679D;&#x57FA;&#x4E8E;&#x8D2A;&#x5FC3;&#x5B58;&#x5728;&#x6B20;&#x62DF;&#x5408;&#x7684;&#x98CE;&#x9669;&#x3002;</p>
</li>
<li><p>Page82: &#x51B3;&#x7B56;&#x6811;&#x6869;(decison stump)</p>
<p>  &#x4EC5;&#x6709;&#x4E00;&#x5C42;&#x5212;&#x5206;&#x7684;&#x51B3;&#x7B56;&#x6811;&#x3002;</p>
</li>
<li><p>Page83: &#x79BB;&#x6563;&#x5316;</p>
<p>  &#x8FDE;&#x7EED;&#x5C5E;&#x6027;&#x8F6C;&#x4E3A;&#x79BB;&#x6563;&#x503C;&#xFF0C;&#x53EF;&#x7528;&#x4E8C;&#x5206;&#x6CD5;&#x3002;</p>
</li>
<li><p>Page85: &#x7F3A;&#x5931;&#x503C;</p>
<p>  &#x6837;&#x672C;&#x5728;&#x67D0;&#x4E9B;&#x5C5E;&#x6027;&#x4E0A;&#x7684;&#x53D6;&#x503C;&#x672A;&#x77E5;&#x3002;</p>
</li>
<li><p>Page88: &#x591A;&#x53D8;&#x91CF;&#x51B3;&#x7B56;&#x6811;(92)&#xFF08;multivariate decision tree&#xFF09;</p>
<p>  &#x6BCF;&#x4E2A;&#x7ED3;&#x70B9;&#x7ED3;&#x5408;&#x591A;&#x4E2A;&#x53D8;&#x91CF;&#x5B66;&#x4E60;&#x4E00;&#x4E2A;&#x7EBF;&#x6027;&#x5206;&#x7C7B;&#x5668;&#xFF0C;&#x6BD4;&#x5982;-0.8*&#x5BC6;&#x5EA6;-0.044*&#x542B;&#x7CD6;&#x7387;&lt;=-0.313&#xFF0C;&#x8FD9;&#x6837;&#x7684;&#x591A;&#x4E2A;&#x7ED3;&#x70B9;&#x6784;&#x6210;&#x7684;&#x51B3;&#x7B56;&#x6811;&#x3002;</p>
</li>
<li><p>Page90: &#x659C;&#x51B3;&#x7B56;&#x6811;&#xFF08;oblique descision tree&#xFF09;</p>
<p>  &#x540C;&#x591A;&#x53D8;&#x91CF;&#x51B3;&#x7B56;&#x6811;</p>
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<li><p>Page92: &#x589E;&#x91CF;&#x5B66;&#x4E60;(109)&#xFF08;incremental learning&#xFF09;</p>
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